<script language=JavaScript> <!-- var message=""; /////////////////////////////////// function clickIE() {if (document.all) {(message);return false;}} function clickNS(e) {if (document.layers||(document.getElementById&&!document.all)) { if (e.which==2||e.which==3) {(message);return false;}}} if (document.layers) {document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;} else{document.onmouseup=clickNS;document.oncontextmenu=clickIE;} // --> </script>

Para nem o mouse nem teclado funcionarem:

<script language=JavaScript> function click() { if (event.button==2) { alert('naum copie'); } } function keypresed() { alert('naum copie'); } document.onkeydown=keypresed; document.onmousedown=click; </script>